An evaluation of shot peening, residual stress and stress relaxation on the fatigue life of AISI 4340 steel

被引：473
|
作者：
Torres, MAS
Voorwald, HJC
机构：
[1] State Univ Sao Paulo, Dept Mech, UNESP, FEG, BR-12516410 Guaratingueta, SP, Brazil
[2] State Univ Sao Paulo, Dept Mat & Technol, BR-12516410 Guaratingueta, SP, Brazil
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2002年 / 24卷 / 08期
关键词：
shot peening; residual stress; 4340; steel; fatigue;
D O I：
10.1016/S0142-1123(01)00205-5
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
Shot peening is a method widely used to improve the fatigue strength of materials. through the creation of a compressive residual stress field (CRSF) in their surface layers. In the present research the gain in fatigue life of AISI 4340 steel, Used in landing gear. is evaluated under four Shot peening conditions. Rotating bending fatigue tests were conducted and the CRSF was measured by an X-ray tensometry prior and during fatigue tests. It was observed that relaxation of the CRSF occurred due to the fatigue process. In addition, the fractured fatigue specimens were investigated using a scanning electron microscope in order to obtain information about the crack initiation points. The evaluation of fatigue life, relaxation of CRSF and crack sources are discussed. (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：877 / 886
页数：10
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